Magneto for explosion-motors



T. RUHLMANN AND C. KOTTMANN.

MAGNETO FOR EXPLOSION MOTORS. APPLICATION FILED AUG. 9I 19-16- RENEWED JAN. 14, 192i.

1,370,157, L Patented Mar. 1,1921.

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MAGNETO FOR E-XPLOSIONMOTORS. APPLICATION msu Aucfimnie. RENEWED um. 14. 1 921.

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Patented Mar. 1, 1921;

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UNITED "STATES PATENT oFncE.

THEODOR R'UHLMANN AND CARL KOTTMANN, OF YORK, N.- Y.

MAGNETO FOB EXPLOSION-MOTORS.

To all whom it may concern.

Be it known that we, Trmooon R HL- MANN and CARL" KOTTMANN, subjects of the German Emperor, residing at New York, in the counties of 'New York and Bronx, respectively, and State of-New York, have invented certain new and useful Improvements in Magnetos for Explosion-Motors, of which'the following is a specification.

The present-invention relates to high tension magnetos for ignition of the gases in ex losion motors.

ith magnetos of the hitherto known structure, the magnetic interruption occurs always at one and the same point and often does not coincide with the break of the electric circuit. In such cases the current gener ated in the armature is enfeebled and fails to bring about ignition.

Furthermore, the starting of the motor is more or less troublesome, as several rapid turns of the armature are generally required in order that a sufiiciently strong current be induced.

To remove these drawbacks is the chief object of our invention.

We accomplish this object by providing a magneto structure whereby the spaces between the poles of the permanent magnets may, at certain times, be overbridged so that the magneto, without demagnetizing the permanent magnets, may be operated by a separate battery current flowing in either direction.

Our invention also consists in the construction, combination and arrangement of parts as will be hereinafter more fully described and set forth in the annexed claims.

In the accompanying drawing, which forms part of this specification, Fi re 1 is a vertical section of the magneto; ig. 2 is an end elevation thereof, partly in section; Figs. 3 and 4 are vertical sections of the magneto illustrating the diflerent positions of the armature and the sleeve inclos ing the same; Fig. 5 is an end view of the sleeve and the sleeve 0 erating arm and Fig. 6 is ad1agram of t e electric connec- The' magneto is substantially of'well known construction, the same comprising permanent horse-shoe magnets a, a, the cas- 111g 6, the armature c, the condenser d, the

' 't'breaker e and the distribution mechrrc anisni- Specification of Letters Patent.

In accordance with our invention, the armature is not arranged directly in the space between the magnet poles a but between two segments 9, g of arcuate cross section which are revolubly mounted between the poles of the permanent magnets and which extend longitudinally of the armature. The segments g, g are diametrically opposed to each other and connected together by nonmagnetic parts or segments 9 which, together with them, form a sleeve. Secured to the magnetic segments g, g of the sleeve by screws h or other- .Patented Mar. 1 1921.

Application filed August 9, 1916, Serial No. 113,865. Renewed January 14, 1921. Serial No. 487,559.

wise are caps 11, i of which cap 71', has connected to it an arm 7 arranged outside of the casing b and which serves both for the adjustment of the said segments and as a circuit closer. The armature c is, as already stated, mounted within said sleeve by means of annular ball bearings 73 provided between the caps z", i and the parts Z, 1 respectively which are connected to the armature.

Part Z is the armature shaft which extends outwardl from the casin b and carries the coup ing R, whereby mm a suitable source rota motion is transmitted to the armature. art 1 is an insulated metal sleeve or tubular piece fixed\to the armature and on which is suitably mounted the circuit breaker e. The latter consists substantially of a disk 6 held in position on the sleeve Z by a nut Z and formed with a contact piece 8 and a tripping lever e formed with a contact piece 6 adapted to cooperate with the contact piece 6 (Fig.

2). The tripping lever is fulcrumedat e to a part revolving together with the armature and is adapted tobe actuated by two cam surfaces b, 12* arranged in its path within the casing 12 so that twice during a full revolution they contact piece 6 will be lifted from contact with the contact piece 6 and thereby break the circuit. The nut Z also serves to conductively connect the sleeve Z with the contact piece e Z is a ring which is insulated from the mass and conductively connected to the contact piece 6 Z is'an insulated carbon contacting with the ring 1. One end of the primary coil m and one end of the condenser d are connected'to the mass orgrounded, as at m and d respectively. The other end of the condenser is connected at m to the'other end of the primary coil, which at m is connected to the sleeve Z To this last named end of the primary coil is also connected, at n, one end of the secondary coil 1%, the opposite end of which leads to the high tension conductor 0 from which the current is conveyed in well known manner to the distributing mechanism f. Outside of the .casing 22 we provide a battery p, an electric vibrator g, of well known construction, a manual switch 2 and a removable electric contact piece 8. The latter is arranged in the path of the lever or arm j so that on turning the latter in a certain direction, as indicated by dotted lines in Fig. 5, it will come into contact with the contact piece .9.

The electric connections between the batte and the magneto are as follows:

ne pole p of the battery p is connected to one pole g of the vibrator q, the other pole g of which is connected to the insulated contact piece a. The other pole 10 of the battery is connected to a contact point r of the hand switch 7. Another contact point of the switch is grounded as at 5 The carbon Z in contact with part Z is connected to the point r of the hand switch 1'.

The magnetic segments g, between which the armature is mounted are so admeasured that when in the position shown in Fig. 4 they will overbridge the space between the pole shoes of the permanent magnets and allow the force lines to directly pass from one pole to the other or become short circuited, as a result of which no lines will go through the core of the armature and no current will be generatedin the coils thereof by reason of the flux from the permanent magnets. But when the segments are adjusted to the position shown in Fig. 3, the force lines will pass from the right hand pole 0: through piece 9 and shoe 0 of the armature to the core 0 of the latter, thenthrough shoe 0*, segment g to the other pole a of the permanent magnet, thereby generating a current in the coils of the armature.

Owing to this adjustability' of the magnetic segments, it will be thus possible, when starting the motor, to short-circuit the forcelines between the poles by turning the segments from the position shown in Fig. 3

' into that shown in Fig. 4, and then start the motor by the use of a battery circuit without causing a discharge or demagnetization of the permanent magnets. The lever j whereby the segments 9', g are manipulated and which is conductively connected to the armature when turned to bring segments 9', g into the position shown in Fig. 4 will be brought into contact with the contact point s, and thereby close the circuit of the battery p. --The battery current will flow through the primary coil of the armature and, owing primarily to the interruption of the. current by the vibrator and to the operation of the circuit breaker 6, like the current generated by the permanent magnets, become converted into a high tension current.

It will be seen that in both positions of Figs. 3 and 4 the ignition will take place when the points 0 and c of the armature shoes 0*, 0 respectively are about one-eighth of an inch away from the ends of the segments g, that is to say, a short time after the magnetic interruption. The electric circuit breaker e, revolving with the armature, is timed to break the. generated current synchronously with the magnetic interruption and in consequence thereof conver the low tension current into a high tension current.

In the position shown in Fig. 6 of the arm of the switch 1-, the battery circuit alone operates, whereas when the arm is swung to contact with point r the battery circuit is opened and the permanent magnets are in operation.

The operation of the magneto is as follows:

To start the magneto the switch 7' is put into position shown in Fig. 6 and the segments 9', g are turned by means of the lever j from the position shown in Fig. 3 into that of Fig. 4. Twice during a revolution of the armature, that is, each time the circuit will be made through the circuit breaker e, the battery current will be caused to flow through the armature coils and owing to the interruption of the current by the vibrator produce a high tension current, which, will as usually produce the sparks at the spark plugs. As seen, owing to the adjustment of the segments relative to the magnetic poles, the force linesbetween the magnetic poles will be short circuitedso that the permanent magnets will not be demagnetized.

*When the arm j is turned back into the position shown in Fig. 5, the sleeves g, g are reset into their position shown in Fig. 3 so that while the switch 7'' is adjusted to the contact point 7, the permanent magnets alone can operate the apparatus;

In order to stop the motor when the segments 9', g are in the position of Fig. 8, the switch arm must be adjusted from point a to point 7".

What we claim and desire Letters Patent is:

l. l'na magneto for combustion motors, the combination with permanent magnets, of diametrically opposed segments of magnetic material between the poles of the magnets, an armature rotatively mounted between said segments, said segments being so admeasured that in a certain position thereof they will overbridge the spaces between said poles and allow the force lines of directly passing from one pole to the other, and means whereby the said segto secure by ments may be moved to overbridge the spaces between the poles of the permanent magnets.

2. A magneto for combustion motors, comprising permanent magnets, diametrically opposed segments between and adjustable relative to said poles of said magnets, an armature rotatively mounted between said segments, a coil mounted thereon, means forconverting the current flowing through said coil of said armature into a high tension current, a separate electric source, means for adjusting said segments so as to overbridge the spaces between the said poles and slmultaneously closing the 'circuit of said separate electric source and electric connections. such that on the closure of the electric circuit of said separate electric- THEO'DOR RUHLMANN. CARL KOTTMANN.

Witnesses.

' D. B. KLEIN,

MAX D. ORDMANN. 

